Unfortunately, aMetro isn't as complete as it could be. For example, the Munich map only includes the U-Bahn (the subways); Munich residents would also know that fast trains (S-Bahn), trams, and buses are equally important to get around the Bavarian capital.
In addition, many of the maps are outdated. Thus, before you download a particular map, check when it was last updated; the date is listed when you click on Details.
All in all, aMetro is off to a good start, but it needs improvement. In the meantime, I recommend finding an app that caters specifically to your destination of choice, since it is more likely to have an updated public transportation map.
-- Isabel Eva Bohrer